The fauna of winter geometrids in Taiwan was explored in the previous studies (Nakajima, 1990; 1994) and only two species, i.e. Operophtera brunnea Nakajima, 1991 (= O. variabilis Nakajima, 1991) and Phigalia owadai Nakajima, 1994 were recorded. Recently we collected a male specimen belonging to the genus Phigaliohybernia Inoue, 1942 in Xicun (1,090m), northern Taiwan. Having compared to P. fulvinfula Inoue, 1942, an endemic species ranging in Honshu, Shikoku and Kyushu, Japan (Nakajima,1998; Sato, 2011), we proved the Taiwanese and Japanese specimens are conspecific. Therefore, the recent discovery gave new biogeographic evidence showing the range extension of P. fulvinfula, also the third winter geometrid moth recorded in Taiwan. The single specimen was deposited in Insect Collection, Taiwan Forestry Research Institute, Taipei, Taiwan (TFRI).